mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-05 02:51:00 +00:00
d456dfbaa0
Change 'clksel' callback function to allow the code to return a status. This patch is a preparation for enabling Arm-Trusted-Firmware (ATF) in Intel SoC FPGA. This patch does not change functionality. When using Arm-Trusted-Firmware (ATF) in Intel SoC FPGA, the MMC clock related register is secure register which is required to be written via SMC/PCSI call. It is possible that U-Boot fail to write the register if there is unexpected error between U-Boot and ATF. As a result, there maybe signal integrity on MMC connection due to clock. So, the code should reports error to user when 'clksel' fail. Signed-off-by: Siew Chin Lim <elly.siew.chin.lim@intel.com>
239 lines
6 KiB
C
239 lines
6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* (C) Copyright 2016 Nexell
|
|
* Youngbok, Park <park@nexell.co.kr>
|
|
*
|
|
* (C) Copyright 2019 Stefan Bosch <stefan_b@posteo.net>
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <dm.h>
|
|
#include <dt-structs.h>
|
|
#include <dwmmc.h>
|
|
#include <log.h>
|
|
#include <syscon.h>
|
|
#include <asm/arch/reset.h>
|
|
#include <asm/arch/clk.h>
|
|
|
|
#define DWMCI_CLKSEL 0x09C
|
|
#define DWMCI_SHIFT_0 0x0
|
|
#define DWMCI_SHIFT_1 0x1
|
|
#define DWMCI_SHIFT_2 0x2
|
|
#define DWMCI_SHIFT_3 0x3
|
|
#define DWMCI_SET_SAMPLE_CLK(x) (x)
|
|
#define DWMCI_SET_DRV_CLK(x) ((x) << 16)
|
|
#define DWMCI_SET_DIV_RATIO(x) ((x) << 24)
|
|
#define DWMCI_CLKCTRL 0x114
|
|
#define NX_MMC_CLK_DELAY(x, y, a, b) ((((x) & 0xFF) << 0) |\
|
|
(((y) & 0x03) << 16) |\
|
|
(((a) & 0xFF) << 8) |\
|
|
(((b) & 0x03) << 24))
|
|
|
|
struct nexell_mmc_plat {
|
|
struct mmc_config cfg;
|
|
struct mmc mmc;
|
|
};
|
|
|
|
struct nexell_dwmmc_priv {
|
|
struct clk *clk;
|
|
struct dwmci_host host;
|
|
int fifo_size;
|
|
bool fifo_mode;
|
|
int frequency;
|
|
u32 min_freq;
|
|
u32 max_freq;
|
|
int d_delay;
|
|
int d_shift;
|
|
int s_delay;
|
|
int s_shift;
|
|
bool mmcboost;
|
|
};
|
|
|
|
struct clk *clk_get(const char *id);
|
|
|
|
static int nx_dw_mmc_clksel(struct dwmci_host *host)
|
|
{
|
|
/* host->priv is pointer to "struct udevice" */
|
|
struct nexell_dwmmc_priv *priv = dev_get_priv(host->priv);
|
|
u32 val;
|
|
|
|
if (priv->mmcboost)
|
|
val = DWMCI_SET_SAMPLE_CLK(DWMCI_SHIFT_0) |
|
|
DWMCI_SET_DRV_CLK(DWMCI_SHIFT_0) | DWMCI_SET_DIV_RATIO(1);
|
|
else
|
|
val = DWMCI_SET_SAMPLE_CLK(DWMCI_SHIFT_0) |
|
|
DWMCI_SET_DRV_CLK(DWMCI_SHIFT_0) | DWMCI_SET_DIV_RATIO(3);
|
|
|
|
dwmci_writel(host, DWMCI_CLKSEL, val);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void nx_dw_mmc_reset(int ch)
|
|
{
|
|
int rst_id = RESET_ID_SDMMC0 + ch;
|
|
|
|
nx_rstcon_setrst(rst_id, 0);
|
|
nx_rstcon_setrst(rst_id, 1);
|
|
}
|
|
|
|
static void nx_dw_mmc_clk_delay(struct udevice *dev)
|
|
{
|
|
unsigned int delay;
|
|
struct nexell_dwmmc_priv *priv = dev_get_priv(dev);
|
|
struct dwmci_host *host = &priv->host;
|
|
|
|
delay = NX_MMC_CLK_DELAY(priv->d_delay,
|
|
priv->d_shift, priv->s_delay, priv->s_shift);
|
|
|
|
writel(delay, (host->ioaddr + DWMCI_CLKCTRL));
|
|
debug("%s: Values set: d_delay==%d, d_shift==%d, s_delay==%d, "
|
|
"s_shift==%d\n", __func__, priv->d_delay, priv->d_shift,
|
|
priv->s_delay, priv->s_shift);
|
|
}
|
|
|
|
static unsigned int nx_dw_mmc_get_clk(struct dwmci_host *host, uint freq)
|
|
{
|
|
struct clk *clk;
|
|
struct udevice *dev = host->priv;
|
|
struct nexell_dwmmc_priv *priv = dev_get_priv(dev);
|
|
|
|
int index = host->dev_index;
|
|
char name[50] = { 0, };
|
|
|
|
clk = priv->clk;
|
|
if (!clk) {
|
|
sprintf(name, "%s.%d", DEV_NAME_SDHC, index);
|
|
clk = clk_get((const char *)name);
|
|
if (!clk)
|
|
return 0;
|
|
priv->clk = clk;
|
|
}
|
|
|
|
return clk_get_rate(clk) / 2;
|
|
}
|
|
|
|
static unsigned long nx_dw_mmc_set_clk(struct dwmci_host *host,
|
|
unsigned int rate)
|
|
{
|
|
struct clk *clk;
|
|
char name[50] = { 0, };
|
|
struct udevice *dev = host->priv;
|
|
struct nexell_dwmmc_priv *priv = dev_get_priv(dev);
|
|
|
|
int index = host->dev_index;
|
|
|
|
clk = priv->clk;
|
|
if (!clk) {
|
|
sprintf(name, "%s.%d", DEV_NAME_SDHC, index);
|
|
clk = clk_get((const char *)name);
|
|
if (!clk) {
|
|
debug("%s: clk_get(\"%s\") failed!\n", __func__, name);
|
|
return 0;
|
|
}
|
|
priv->clk = clk;
|
|
}
|
|
|
|
clk_disable(clk);
|
|
rate = clk_set_rate(clk, rate);
|
|
clk_enable(clk);
|
|
|
|
return rate;
|
|
}
|
|
|
|
static int nexell_dwmmc_of_to_plat(struct udevice *dev)
|
|
{
|
|
struct nexell_dwmmc_priv *priv = dev_get_priv(dev);
|
|
struct dwmci_host *host = &priv->host;
|
|
int val = -1;
|
|
|
|
debug("%s\n", __func__);
|
|
|
|
host->name = dev->name;
|
|
host->ioaddr = dev_read_addr_ptr(dev);
|
|
host->buswidth = dev_read_u32_default(dev, "bus-width", 4);
|
|
host->get_mmc_clk = nx_dw_mmc_get_clk;
|
|
host->clksel = nx_dw_mmc_clksel;
|
|
host->priv = dev;
|
|
|
|
val = dev_read_u32_default(dev, "index", -1);
|
|
if (val < 0 || val > 2) {
|
|
debug(" 'index' missing/invalid!\n");
|
|
return -EINVAL;
|
|
}
|
|
host->dev_index = val;
|
|
|
|
priv->fifo_size = dev_read_u32_default(dev, "fifo-size", 0x20);
|
|
priv->fifo_mode = dev_read_bool(dev, "fifo-mode");
|
|
priv->frequency = dev_read_u32_default(dev, "frequency", 50000000);
|
|
priv->max_freq = dev_read_u32_default(dev, "max-frequency", 50000000);
|
|
priv->min_freq = 400000; /* 400 kHz */
|
|
priv->d_delay = dev_read_u32_default(dev, "drive_dly", 0);
|
|
priv->d_shift = dev_read_u32_default(dev, "drive_shift", 3);
|
|
priv->s_delay = dev_read_u32_default(dev, "sample_dly", 0);
|
|
priv->s_shift = dev_read_u32_default(dev, "sample_shift", 2);
|
|
priv->mmcboost = dev_read_u32_default(dev, "mmcboost", 0);
|
|
|
|
debug(" index==%d, name==%s, ioaddr==0x%08x\n",
|
|
host->dev_index, host->name, (u32)host->ioaddr);
|
|
return 0;
|
|
}
|
|
|
|
static int nexell_dwmmc_probe(struct udevice *dev)
|
|
{
|
|
struct nexell_mmc_plat *plat = dev_get_plat(dev);
|
|
struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
|
|
struct nexell_dwmmc_priv *priv = dev_get_priv(dev);
|
|
struct dwmci_host *host = &priv->host;
|
|
struct udevice *pwr_dev __maybe_unused;
|
|
|
|
host->fifoth_val = MSIZE(0x2) |
|
|
RX_WMARK(priv->fifo_size / 2 - 1) |
|
|
TX_WMARK(priv->fifo_size / 2);
|
|
|
|
host->fifo_mode = priv->fifo_mode;
|
|
|
|
dwmci_setup_cfg(&plat->cfg, host, priv->max_freq, priv->min_freq);
|
|
host->mmc = &plat->mmc;
|
|
host->mmc->priv = &priv->host;
|
|
host->mmc->dev = dev;
|
|
upriv->mmc = host->mmc;
|
|
|
|
if (nx_dw_mmc_set_clk(host, priv->frequency * 4) !=
|
|
priv->frequency * 4) {
|
|
debug("%s: nx_dw_mmc_set_clk(host, %d) failed!\n",
|
|
__func__, priv->frequency * 4);
|
|
return -EIO;
|
|
}
|
|
debug("%s: nx_dw_mmc_set_clk(host, %d) OK\n",
|
|
__func__, priv->frequency * 4);
|
|
|
|
nx_dw_mmc_reset(host->dev_index);
|
|
nx_dw_mmc_clk_delay(dev);
|
|
|
|
return dwmci_probe(dev);
|
|
}
|
|
|
|
static int nexell_dwmmc_bind(struct udevice *dev)
|
|
{
|
|
struct nexell_mmc_plat *plat = dev_get_plat(dev);
|
|
|
|
return dwmci_bind(dev, &plat->mmc, &plat->cfg);
|
|
}
|
|
|
|
static const struct udevice_id nexell_dwmmc_ids[] = {
|
|
{ .compatible = "nexell,nexell-dwmmc" },
|
|
{ }
|
|
};
|
|
|
|
U_BOOT_DRIVER(nexell_dwmmc_drv) = {
|
|
.name = "nexell_dwmmc",
|
|
.id = UCLASS_MMC,
|
|
.of_match = nexell_dwmmc_ids,
|
|
.of_to_plat = nexell_dwmmc_of_to_plat,
|
|
.ops = &dm_dwmci_ops,
|
|
.bind = nexell_dwmmc_bind,
|
|
.probe = nexell_dwmmc_probe,
|
|
.priv_auto = sizeof(struct nexell_dwmmc_priv),
|
|
.plat_auto = sizeof(struct nexell_mmc_plat),
|
|
};
|